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69 lines
1.7 KiB
Python
69 lines
1.7 KiB
Python
'''
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Data matrix detector sample.
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Usage:
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video_dmtx {<video device number>|<video file name>}
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Generate a datamatrix from from http://datamatrix.kaywa.com/ and print it out.
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NOTE: This only handles data matrices, generated for text strings of max 3 characters
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Resize the screen to be large enough for your camera to see, and it should find an read it.
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Keyboard shortcuts:
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q or ESC - exit
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space - save current image as datamatrix<frame_number>.jpg
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'''
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import cv2
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import numpy as np
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import sys
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def data_matrix_demo(cap):
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window_name = "Data Matrix Detector"
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frame_number = 0
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need_to_save = False
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while 1:
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ret, frame = cap.read()
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if not ret:
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break
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gray = cv2.cvtColor(frame, cv2.COLOR_RGB2GRAY)
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codes, corners, dmtx = cv2.findDataMatrix(gray)
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cv2.drawDataMatrixCodes(frame, codes, corners)
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cv2.imshow(window_name, frame)
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key = cv2.waitKey(30)
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c = chr(key & 255)
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if c in ['q', 'Q', chr(27)]:
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break
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if c == ' ':
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need_to_save = True
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if need_to_save and codes:
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filename = ("datamatrix%03d.jpg" % frame_number)
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cv2.imwrite(filename, frame)
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print "Saved frame to " + filename
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need_to_save = False
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frame_number += 1
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if __name__ == '__main__':
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print __doc__
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if len(sys.argv) == 1:
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cap = cv2.VideoCapture(0)
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else:
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cap = cv2.VideoCapture(sys.argv[1])
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if not cap.isOpened():
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cap = cv2.VideoCapture(int(sys.argv[1]))
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if not cap.isOpened():
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print 'Cannot initialize video capture'
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sys.exit(-1)
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data_matrix_demo(cap)
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